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The diagnostic codes from public care are transferred to SHCR, but have some missing registration of diagnostic codes due to incomplete journal entries.
One explanation for the missing registration of infections in Swespine would be that a postoperative infection often occurs some time after the patient has been discharged.
Clinics reporting to the database will therefore receive lists every third month on missing registration compared to DPR, as well as a list of missing registration of follow-up visits.
The medical record review revealed four additional recurrences which had not been registered due to incomplete registration of follow-up visits, and the sensitivity of registration of recurrence (including the missing registration of follow-up visits) was then 38% (3/8).
All false or missing registration of data can be a possible source of bias in the results, unless it is random.
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Due to the prospective registration of data in DHR, it is highly unlikely that any missing registrations of the primary THA are systemtically linked to later revision status.
Before conducting each outcome-specific analysis, we excluded patients who: (1) lacked valid registrations of baseline or follow-up measurement, or both, (2) missed registrations of one or more of the characteristics used as covariates in the multilevel regression analyses, and/or (3) had an observation period between baseline and follow-up of less than three months.
We found 1.5% missing registrations for mode of contact, 1.5% for first response initiated, 1.3% for gender, 2.0% for age, and 2.3% missing for priority degree.
In case of missing registration forms, the researcher returned to the school to collect them.
Because of missing registration and/or approval dates, seven protocols were dropped from the study, and the analysis was performed on 969 studies.
Of these, 95 were missing registration data, and hence, were not included in study recruitment.
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